# Calculate the annual growth rate. (emp next year - emp this year)/emp this year


BEGIN {
  FS = ","
  OFS = ","
}

{
  if ($4 == 2001) {
    gr[2001] = 0
    value[2001] = $5
    next
  }
  gr[$4] = ($5-value[$4-1])/value[$4-1]
  value[$4] = $5
  print $0, gr[$4]

}

  
